Lamp for use on motor vehicles and for other purposes



April 17, 1928. 1,666,876 5. L. PRICE LAMP FOR USE ON MOTOR VEHICLES AND FOR OTHER PURPOSES Filed Jan. 17, 1923 Fig].

INVENTOR J1. Price m w d wny 2L4 VLW A fro/tum" Patented A r. 17, 1928.

UNITED STATES PATENT OFFICE.

SIDNEY LEOPOLD PRICE, OF LONDON, ENGLAND.

LAMP FOR USE ON MOTOR VEHICLES AND FOR OTHER PURPOSES.

Application filed January 17,

This invention has reference to lamps for use on motor vehicles and for other purposes the primary object being to eliminate or materially reduce the objectionable dazzle or lare hitherto attendant uponthe use of ordinary reflecting lamps without matcrially reducing the intensity'or illuminating power of the projected beam of reflected li ht.

The problem of eliminating or reducing the glare of automobile headlights has become of great importance within recent years and various efforts have been made for its solution. It has for example been proposed to employ an electric lamp with two filaments one in focus with respect to the reflector and the other out of focus and to use the latter when there is much road traiiic. Various schemes of colouring of the bulb have also been suggested. It has furthermore been proposed to modify the usual conical or cylindrical shape of the reflected beam so as to suppress or modify the upper part of the same. All such methods of solving the problem howeverhave a detrimental influence on the effectiveness of the beam. For example in the ease of using alternate filaments the weaker beam is used when in fact the conditions may require a strong beam; in the case of colouring the bulb, the beam is weakened in proportion to the degree of colour filtration effected; and in the case of distortion of the beam there are disadvantages due to excessive contrast and undesirable displacement. 7

According to the present invention I provide for use with a reflector having a focus, an electric light bulb having therein light emitting means occupying at least in part the focal region, and alight coloring medium the entire body of which is supported by the bulb in a position so far forward of the focally situated light emitting means that substantially all of the rays proceeding from the latter to the reflector are unimpeded by the light coloring medium while other rays are colored thereby.

The preferred embodiment of my invention consists of an ordinary electric light bulb containing secured to its wall remote from the socket a colored bulb or tube of colored glass or the like-which may if desired be frosted-containing an additional or supplementary filament to the ordinary focally situated filament, or a displaced por- 1928, Serial No. 613,214, and in Great Britain January 17, 1922.

tion or extension of the latter, so that the light emanating therefrom becomes colored and supplements the light from the focally :lttlattitl filament without affecting the later. a

1 have found that amber or yellow is a satisfactory color although obviously any other color or colors, may be adopted.

In the accompanying drawings Figure 1 illustrates my improved antidazzle bulb in its operative position with a focussing reflector,

Figures 2 and 3 illustrate two modified forms of the improved bulb.

Referring first more articularly to the arrangement shown in Figure 1 the lamp comprises the glass bulb A mounted on a socket B as usual and an inner glass bulb C secured insidethe bulbA opposite the socket. There are two filaments D and 'E whereof the main filament D islocated at or near the focus of the reflector whereas the filament E is situated out of focus and within the bulb C, the latter being situated well forward of the main filament D.

The bulb C is amber colored the result being that the surface of the reflector F is flooded with amber-colored light from the bulb C without decreasing the intensity of 01' cutting off or absorbing any appreciable.

amount of the main source of light from the filament D at the focus. Consequently the reflector projects a full intensity beam of light but is devoid of dazzle or glare.

Obviously the two filaments might be connected in series as shown at D and E in Figure 2 instead of being inparallel as shown in Figure 1.

In the arrangement shown in Figure 3 the colored bulb shown at C is external to and an extension of the main bulb A instead of being inside the latter as in Figures 1 and 2.

By the term colored when employed in this specification and the appendant claims in reference to the medium for producing the colored rays I do not intend strictly to limit myself to the primary colors but may resort to frosted white or opal glass or other medium.

What I claim and desire to secure by Letters Patent is 1. An electric lamp, comprising the combination with a bulb and a filament therein,

or a second filament f rward o 1 1 3 1? mentioned filament relative to the socket of the bulb, and a li ht coloring enclosure around the second lament and carried by the bulb by a. portion of its wall opposite 5 the socket.

2. An electric lamp, comprising armain bulb and filament, a supplementary filament forward of the main filament, and a supplementary colored bulb secured to the interior of the main bulb on a portion of its wall opposite the bulb socket and surrounding the supplementary filament.

3. An electric lamp, comprising a, main bulb and filament, an amber colored supplementary bulb carried within the main bulb on its wall opposite the bulb socket and a iupglementary filament within the colored SIDNEY LEOPOLD PRICE. 

